Plaster-board.



S. M. FORD. PLASTER BOARD. APPLICATION min MAY 25. 1916.

Patented Apr. 29, 1919.

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board to W ich 0 9 faetory or other board hasbeen-put in place-upon theside tions together,

fillings; the-board and corrugations. together; thereby enabling metojormicorrugations of rectangular shape, ai-fso smasm. roan-or sr. 1mm,nnmnsora.

PLASTER-BOARD.

'leq jea To all whom Jamey gamer n: l v

Be ,it known that I, SILAS M.. FoRn, a citizen 0f the. United States,residing at St. Paul, in the county of Ramsey and State of Minnesota,have invented certain new and useful Improvements in Plaster-Board, ofwhich the followingis a specification.

My invention vnelates to improvements in plaster, of waterproofed paperor other fibrous sheeting corrugated to form lath projectionsandintermediate valleys or depressions, and designed to be secured to thestudding or beams of buildings to form a foundationfor plaster. I

. Theobject of the invention is to provide ajlathsboardsof thatcharacter wherein the valleys or depressions upon the fans of theplaster covering is to be applied are .filled other cementitiousmaterial to form a key base to which the applied plaster will readilyadhere, as well as, to assist in holding the corru ations to form and toprevent them from ingcrushed in handling so as to impair their capacityas air containing or plaster receiving spaces. The valleys can be filledwith this cementitious filling at the convenient place-before thevwalls;-01?,-. M%ili.ngs= f-the uilding, at a cost usually-mush :less ani t p as w r iilled into the board the samewasput A furtherobject oftheinvention is to pro-i vide improved means for securely keying orlocking thecementiti-ous filling to the corrugated-boardand for bind'ngthe corruga- As the cementitious material Willbefilled into the valleyswhen in plastic condition itrw-ill adhere to the corrugatedboardr-it'self, but I prefer to. employ more positive means for holdingthe cementitious also for binding the ired, where the entire outersurface .ofthefilling is exposed and Wherenone of it is held underoverlying-sides of the core Specification of Letters Patent withplaster, mortar, or

. boar anchoring cor, ,s as they Patented Apr. 29, 1919.

Application filed May 2'5, 1916. Serial No. 89,820.

rugations as would be the case where they are of dovetailed orkeyed'lath shape. a

To these ends I have threaded cords or equivalent fibrousinstrumentalities through the board so that the same shall pass into andpreferably transversely through the valleys which are to be filled withcementitious material, so that when the cementitious material has set itwill firmly, grip and ad here to these fibrous instrumentalities;

More particularly the invention consists in the construction,combination and arrangement of parts hereinafter described and claimed vIn the accompanying drawings showing embodiments of theinvention,

vFigure l is a perspective view of a fragment of thecorrugated boardwith its cementitious filling and fibrous .anchoring de vices Fig. 2 isa plan View of a fragment of the board looking down upon the plasteringface thereof before the cementitious material has beenii'lled- Fig. 3 isa bottom view of a fragment of the board showing the cords passingthrough the1 sheet on the under side of the valleys, an

Fig. 4 is a plan view of a fragment of the showin a modified arran ementof 'a'ppear efom the cementitious material has been filled in.

The lath board which is the subject of this invention is mad of fibrous.sheeting, pref- -ble without making the sheet liable to sep ara'te fromthe fillings when-under, pressure as would be, the case if the sides ofthe projections were fl-aredoutwardly.

In the drawings 2 represents the lath projections upon the outer orplastering face of the board, and 3 the projections on the under face ofthe board. The corrugations are shown as rectangular in cross sectionhaving upright sides 4 which are common to the lath projections 2 uponthe outer face of the board and the opposite adjacent pro- 'ections 3 onthe under side of the board.

etween the lath projections 2 are depressions 5 where the oppositelydirected projections 3 are stamped out, while between the lathprojections 3 are similar but oppositely facing depressions 6 formed bystamping out the projections 52.

Through the bottoms or sides of the projections 3 upon the underside ofthe board are threaded or passed cords or other fibrousinstrumentalities which enter the valleys or depressions 5 above theseprojections and serve as keys or locking means to hold the cementitiousmateriel to be filled into these valleys as hereinafter explained.

In Figs. 2 and 3 the fibrous locking means is shown as a continuous cordstitched through the board portion 3 so as to form a sort of lock stitch7 but the method of threading is not essential so long -as it afi'ordswithin the depressions 5 a considerable number of exposed holding endsor parts to wh ch cementitious material can adhere. For instance, inFig. 4 the cord is shown threaded through the board portions 3 so as.toform merely a series of straight loops 8. Ohmously the method ofthreading the cord through the sheet can be varied in any de sired way,and instead of having one long cord threaded in and out through theboard, a number of short pieces of cord can be used, even so short as toallow of being passed only once through the sheet. After the cords havebeen thus incorporated in the board, plaster, mortar or othercementitious material 9 is filled into, the valleys 5 while it is in aplastic state,"and allowed to set and harden. As it setsthe cementitiousfilling will firmly grip and adhere to the board at the bottomsand sidesof the valleys, and particularly to the cordportions at the bottomsthereof so that it will form an integral part of the board, which thencan be shipped in large sheets, and cut .to the desired size at theplace of use.

While the cords at the bottoms of the valleys will hold the cementitiousmaterial firmly to the board at the bottoms of the valleys, the sideportions 4 of the corrugations will be held to the cementitious fillingonly by the adhesion between the board and the fillings. In orderabsolutely to prevent the sides 4 of the corrugations from being pulledaway from the cementitious fillings under tensile or other strains uponthe board, I prefer to pass the cords 10 transversely through thecorrugations below the plastering faces of the projections 2, as shownin Fig. 1, before the cementitious material has been filled in. Thesecords will pierce the side walls 4; of the corrugations and pass throughand across the valleys 5 to be filled with the cementitious material sothat when this material has been filled in, it will adhere to the cords10 as well as-to the side walls 4 and prevent the corrugations frombeing pulled apart under any ordinary strain to which they may besubjected. With the use of the transverse cords 10 it is possible todispense entirely with the anchoring cords in the bottoms of thevalleys, but I prefer to use both forms of lock.

By the term cord as here used is meant any fibrous instrumentality whichwill act in sub stantially the same way as a cord.

I claim:

1. As an article of manufacture, a plaster board comprising a sheet offibrous material corrugated to form interspaced lath projec tions andintermediate valleys, anchoring instrumentalities passing through theboard and into the valleys on the plastering face of the board, andfillings of cementitlous material disposed lengthwise of saidfacevalleys and'filling the same, and. adherent to said anchoringinstrumentalities.

' 2. As an article of manufacture, a plasterboard comprising a sheet offibrous material corrugated to form interspaced lath projections andintermediate valleys, cords passing through the board and into thevalleys on the plastering face of the board, and fillings ofcementitious material disposed lengthwise of said face-valleys andfilling the same, and adherent to said cords.

8. As an article of manufacture, a plasterboard comprising a sheet offibrous material corrugated to form inters aced lath projections andintermediate val eys, cords threaded through the bottoms of the facevalleys and projecting'into the same, and fillings of cementitiousmaterial disposed lengthwise of said face valleysand filling thesame-and adherent to said cords. 1 r i 1?? 4. As anarticleofmanufacture, a plasterboard comprising a sheet of fibrousmaterial corrugated to form interspaced lath projections andintermediate valleys, cords passing transversely through thecorrugations and traversing the valleys on the plastering face of theboard, and fillings of cementiti'ousmaterial arranged lengthwise of saidface-valleys and filling the same, and adherent to said cords.

5. As an article of manufacture, a plasterboard comprising a sheet offlexible material corrugated to form interspaced lath projections andintermediate valleys, anchoring cords passing through the bottoms of theface valleys and extending up into the same, bindi valleys,and fillingsof cementitious material disposed lengthwise ofsaid face valleys andfilling the same and adherent to said cords. 6. As an article ofmanufacture, a plasterboard comprising a sheet of fibrous materialcorrugated to forminterspaced lath projec tions and intermediatevalleys, cords thread- 10 ed through the bottoms of the face valleys andextending up into and along the same,

i and fillings of cementitious materlal disposed lengthwise of saidValleys and filling the same andadherent to said cords.

In testimony whereof I aflix my signature 15 s in presence oftwowitnesses.

SILAS M. FORD. Witnesses: i

a ARTHUR P. LOTHROP, BEATRICE BROWN.

Copies of this patent may be obtained: five cent: each, by addressingthe Commissioner of ratentl.

Wellington, D. 0. s a i i

